"Rural residents who drink water from private wells are much more likely to have Parkinson's disease, a finding that bolsters theories that farm pesticides may be partially to blame, according to a new study. The risk to people in California's Central Valley was 90 percent higher for those who had private wells near fields sprayed with certain insecticides. People with the incurable neurological disease "were more likely to have consumed private well water, and had consumed it on average 4.3 years longer," UCLA scientists reported. Unlike municipal water supplies, private wells are largely unregulated and are not monitored for contaminants. "